I'm pretty sure that model just defines the resistor temperature coefficient. You can get around this error by commenting that line and changing the previous line that uses that model to not use the model. The two lines:

Rbias 3 4 Rtc 8k

.MODEL Rtc RES TC1=-0.0055

change to

Rbias 3 4 8k

*.MODEL Rtc RES TC1=-0.0055

This removes the temperature sensitive effect but will get the simulation running.